doi:10.1016/j.jeurceramsoc.2005.09.036
Copyright © 2005 Elsevier Ltd All rights reserved.
Microstructure and properties of Al2O3–TiC nanocomposites fabricated by spark plasma sintering from high-energy ball milled reactants
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Yanfeng Zhanga, Lianjun Wanga, Wan Jiang
, a,
, Lidong Chena and Guangzhao Baia
aState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
Received 9 June 2005;
revised 27 August 2005;
accepted 3 September 2005.
Available online 24 October 2005.
Abstract
In situ synthesis of Al2O3–TiC nanocomposite powders from a mixture of titanium, graphite, and Al2O3 powders by high-energy ball milling (HEBM) and its consolidation through spark plasma sintering (SPS) were investigated. After being milled for 25 h at ambient temperature, the powder mixtures were mainly composed of homogeneous nanosized Al2O3 particle and amorphous TiC solid solution. The relative density of the samples consolidated by SPS technique in vacuum at 1480 °C for 4 min reached 99.2%. The final products exhibited very fine microstructure, and the grain sizes of Al2O3 and TiC were about 400 nm and 200 nm, respectively, with a flexure strength of 944 ± 21 MPa, Vickers hardness 21.0 ± 0.3 GPa, fracture toughness 3.87 ± 0.2 MPa m1/2, and electrical conductivity 1.2787 × 105 S m−1.
Keywords: Al2O3–TiC; Milling; Nanocomposites; Mechanical properties; SPS
Fig. 1. XRD patterns of the collected powders after different milling periods and the as-prepared product: (a) 0 h; (b) 10 h; (c) 15 h; (d) 20 h; (e) 25 h; (f) 25 h of milling followed by SPS at 1480 °C for 4 min under 50 MPa.
Fig. 2. TEM micrograph of powder mixtures milled for 25 h and corresponding selected area electron diffraction (SAD) pattern. Bright continuous diffraction rings of TiC indicate yielding of a large quantity of TiC particles during ball milling process.
Fig. 3. Backscattered SEM image of polished surface of the sintered sample. The gray-white phase is the TiC, and the dark phase is the Al2O3 matrix.
Fig. 4. SEM micrograph of fracture surface of the sintered sample.
Fig. 5. TEM image of the sintered sample with electron diffraction patterns of Al2O3 and TiC.
Table 1.
Mechanical properties and electrical conductivity of the sintered sample

No. 1 sample: Al2O3 + 40 wt.%TiC (35 vol%TiC); *HSPS: high-energy ball milling + SPS; No. 2 sample22: Al2O3 + 30 vol%TiC; *WHP: wet milling + hot-pressing sintering.

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